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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #define LOG_TAG "healthd-common"
     18 #define KLOG_LEVEL 6
     19 
     20 #include <healthd/healthd.h>
     21 #include <healthd/BatteryMonitor.h>
     22 
     23 #include <errno.h>
     24 #include <libgen.h>
     25 #include <stdio.h>
     26 #include <stdlib.h>
     27 #include <string.h>
     28 #include <unistd.h>
     29 #include <batteryservice/BatteryService.h>
     30 #include <cutils/klog.h>
     31 #include <cutils/uevent.h>
     32 #include <sys/epoll.h>
     33 #include <sys/timerfd.h>
     34 #include <utils/Errors.h>
     35 
     36 using namespace android;
     37 
     38 #ifndef BOARD_PERIODIC_CHORES_INTERVAL_FAST
     39   // Periodic chores fast interval in seconds
     40   #define DEFAULT_PERIODIC_CHORES_INTERVAL_FAST (60 * 1)
     41 #else
     42   #define DEFAULT_PERIODIC_CHORES_INTERVAL_FAST (BOARD_PERIODIC_CHORES_INTERVAL_FAST)
     43 #endif
     44 
     45 #ifndef BOARD_PERIODIC_CHORES_INTERVAL_SLOW
     46   // Periodic chores fast interval in seconds
     47   #define DEFAULT_PERIODIC_CHORES_INTERVAL_SLOW (60 * 10)
     48 #else
     49   #define DEFAULT_PERIODIC_CHORES_INTERVAL_SLOW (BOARD_PERIODIC_CHORES_INTERVAL_SLOW)
     50 #endif
     51 
     52 static struct healthd_config healthd_config = {
     53     .periodic_chores_interval_fast = DEFAULT_PERIODIC_CHORES_INTERVAL_FAST,
     54     .periodic_chores_interval_slow = DEFAULT_PERIODIC_CHORES_INTERVAL_SLOW,
     55     .batteryStatusPath = String8(String8::kEmptyString),
     56     .batteryHealthPath = String8(String8::kEmptyString),
     57     .batteryPresentPath = String8(String8::kEmptyString),
     58     .batteryCapacityPath = String8(String8::kEmptyString),
     59     .batteryVoltagePath = String8(String8::kEmptyString),
     60     .batteryTemperaturePath = String8(String8::kEmptyString),
     61     .batteryTechnologyPath = String8(String8::kEmptyString),
     62     .batteryCurrentNowPath = String8(String8::kEmptyString),
     63     .batteryCurrentAvgPath = String8(String8::kEmptyString),
     64     .batteryChargeCounterPath = String8(String8::kEmptyString),
     65     .batteryFullChargePath = String8(String8::kEmptyString),
     66     .batteryCycleCountPath = String8(String8::kEmptyString),
     67     .energyCounter = NULL,
     68     .boot_min_cap = 0,
     69     .screen_on = NULL,
     70 };
     71 
     72 static int eventct;
     73 static int epollfd;
     74 
     75 #define POWER_SUPPLY_SUBSYSTEM "power_supply"
     76 
     77 // epoll_create() parameter is actually unused
     78 #define MAX_EPOLL_EVENTS 40
     79 static int uevent_fd;
     80 static int wakealarm_fd;
     81 
     82 // -1 for no epoll timeout
     83 static int awake_poll_interval = -1;
     84 
     85 static int wakealarm_wake_interval = DEFAULT_PERIODIC_CHORES_INTERVAL_FAST;
     86 
     87 static BatteryMonitor* gBatteryMonitor;
     88 
     89 struct healthd_mode_ops *healthd_mode_ops;
     90 
     91 int healthd_register_event(int fd, void (*handler)(uint32_t), EventWakeup wakeup) {
     92     struct epoll_event ev;
     93 
     94     ev.events = EPOLLIN;
     95 
     96     if (wakeup == EVENT_WAKEUP_FD)
     97         ev.events |= EPOLLWAKEUP;
     98 
     99     ev.data.ptr = (void *)handler;
    100     if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev) == -1) {
    101         KLOG_ERROR(LOG_TAG,
    102                    "epoll_ctl failed; errno=%d\n", errno);
    103         return -1;
    104     }
    105 
    106     eventct++;
    107     return 0;
    108 }
    109 
    110 static void wakealarm_set_interval(int interval) {
    111     struct itimerspec itval;
    112 
    113     if (wakealarm_fd == -1)
    114             return;
    115 
    116     wakealarm_wake_interval = interval;
    117 
    118     if (interval == -1)
    119         interval = 0;
    120 
    121     itval.it_interval.tv_sec = interval;
    122     itval.it_interval.tv_nsec = 0;
    123     itval.it_value.tv_sec = interval;
    124     itval.it_value.tv_nsec = 0;
    125 
    126     if (timerfd_settime(wakealarm_fd, 0, &itval, NULL) == -1)
    127         KLOG_ERROR(LOG_TAG, "wakealarm_set_interval: timerfd_settime failed\n");
    128 }
    129 
    130 status_t healthd_get_property(int id, struct BatteryProperty *val) {
    131     return gBatteryMonitor->getProperty(id, val);
    132 }
    133 
    134 void healthd_battery_update(void) {
    135     // Fast wake interval when on charger (watch for overheat);
    136     // slow wake interval when on battery (watch for drained battery).
    137 
    138    int new_wake_interval = gBatteryMonitor->update() ?
    139        healthd_config.periodic_chores_interval_fast :
    140            healthd_config.periodic_chores_interval_slow;
    141 
    142     if (new_wake_interval != wakealarm_wake_interval)
    143             wakealarm_set_interval(new_wake_interval);
    144 
    145     // During awake periods poll at fast rate.  If wake alarm is set at fast
    146     // rate then just use the alarm; if wake alarm is set at slow rate then
    147     // poll at fast rate while awake and let alarm wake up at slow rate when
    148     // asleep.
    149 
    150     if (healthd_config.periodic_chores_interval_fast == -1)
    151         awake_poll_interval = -1;
    152     else
    153         awake_poll_interval =
    154             new_wake_interval == healthd_config.periodic_chores_interval_fast ?
    155                 -1 : healthd_config.periodic_chores_interval_fast * 1000;
    156 }
    157 
    158 void healthd_dump_battery_state(int fd) {
    159     gBatteryMonitor->dumpState(fd);
    160     fsync(fd);
    161 }
    162 
    163 static void periodic_chores() {
    164     healthd_battery_update();
    165 }
    166 
    167 #define UEVENT_MSG_LEN 2048
    168 static void uevent_event(uint32_t /*epevents*/) {
    169     char msg[UEVENT_MSG_LEN+2];
    170     char *cp;
    171     int n;
    172 
    173     n = uevent_kernel_multicast_recv(uevent_fd, msg, UEVENT_MSG_LEN);
    174     if (n <= 0)
    175         return;
    176     if (n >= UEVENT_MSG_LEN)   /* overflow -- discard */
    177         return;
    178 
    179     msg[n] = '\0';
    180     msg[n+1] = '\0';
    181     cp = msg;
    182 
    183     while (*cp) {
    184         if (!strcmp(cp, "SUBSYSTEM=" POWER_SUPPLY_SUBSYSTEM)) {
    185             healthd_battery_update();
    186             break;
    187         }
    188 
    189         /* advance to after the next \0 */
    190         while (*cp++)
    191             ;
    192     }
    193 }
    194 
    195 static void uevent_init(void) {
    196     uevent_fd = uevent_open_socket(64*1024, true);
    197 
    198     if (uevent_fd < 0) {
    199         KLOG_ERROR(LOG_TAG, "uevent_init: uevent_open_socket failed\n");
    200         return;
    201     }
    202 
    203     fcntl(uevent_fd, F_SETFL, O_NONBLOCK);
    204     if (healthd_register_event(uevent_fd, uevent_event, EVENT_WAKEUP_FD))
    205         KLOG_ERROR(LOG_TAG,
    206                    "register for uevent events failed\n");
    207 }
    208 
    209 static void wakealarm_event(uint32_t /*epevents*/) {
    210     unsigned long long wakeups;
    211 
    212     if (read(wakealarm_fd, &wakeups, sizeof(wakeups)) == -1) {
    213         KLOG_ERROR(LOG_TAG, "wakealarm_event: read wakealarm fd failed\n");
    214         return;
    215     }
    216 
    217     periodic_chores();
    218 }
    219 
    220 static void wakealarm_init(void) {
    221     wakealarm_fd = timerfd_create(CLOCK_BOOTTIME_ALARM, TFD_NONBLOCK);
    222     if (wakealarm_fd == -1) {
    223         KLOG_ERROR(LOG_TAG, "wakealarm_init: timerfd_create failed\n");
    224         return;
    225     }
    226 
    227     if (healthd_register_event(wakealarm_fd, wakealarm_event, EVENT_WAKEUP_FD))
    228         KLOG_ERROR(LOG_TAG,
    229                    "Registration of wakealarm event failed\n");
    230 
    231     wakealarm_set_interval(healthd_config.periodic_chores_interval_fast);
    232 }
    233 
    234 static void healthd_mainloop(void) {
    235     int nevents = 0;
    236     while (1) {
    237         struct epoll_event events[eventct];
    238         int timeout = awake_poll_interval;
    239         int mode_timeout;
    240 
    241         /* Don't wait for first timer timeout to run periodic chores */
    242         if (!nevents)
    243             periodic_chores();
    244 
    245         healthd_mode_ops->heartbeat();
    246 
    247         mode_timeout = healthd_mode_ops->preparetowait();
    248         if (timeout < 0 || (mode_timeout > 0 && mode_timeout < timeout))
    249             timeout = mode_timeout;
    250         nevents = epoll_wait(epollfd, events, eventct, timeout);
    251         if (nevents == -1) {
    252             if (errno == EINTR)
    253                 continue;
    254             KLOG_ERROR(LOG_TAG, "healthd_mainloop: epoll_wait failed\n");
    255             break;
    256         }
    257 
    258         for (int n = 0; n < nevents; ++n) {
    259             if (events[n].data.ptr)
    260                 (*(void (*)(int))events[n].data.ptr)(events[n].events);
    261         }
    262     }
    263 
    264     return;
    265 }
    266 
    267 static int healthd_init() {
    268     epollfd = epoll_create(MAX_EPOLL_EVENTS);
    269     if (epollfd == -1) {
    270         KLOG_ERROR(LOG_TAG,
    271                    "epoll_create failed; errno=%d\n",
    272                    errno);
    273         return -1;
    274     }
    275 
    276     healthd_board_init(&healthd_config);
    277     healthd_mode_ops->init(&healthd_config);
    278     wakealarm_init();
    279     uevent_init();
    280     gBatteryMonitor = new BatteryMonitor();
    281     gBatteryMonitor->init(&healthd_config);
    282     return 0;
    283 }
    284 
    285 int healthd_main() {
    286     int ret;
    287 
    288     klog_set_level(KLOG_LEVEL);
    289 
    290     if (!healthd_mode_ops) {
    291         KLOG_ERROR("healthd ops not set, exiting\n");
    292         exit(1);
    293     }
    294 
    295     ret = healthd_init();
    296     if (ret) {
    297         KLOG_ERROR("Initialization failed, exiting\n");
    298         exit(2);
    299     }
    300 
    301     healthd_mainloop();
    302     KLOG_ERROR("Main loop terminated, exiting\n");
    303     return 3;
    304 }
    305